Restricted???

[fazersharp]

your filter look like OEM and ok to me heres my old and new one

[Silverlegacy]

your filter look like OEM and ok to me heres my old and new one

Maybe mine isnt too old then? i gave it a hoover out and cleaned inside the air box.
Waiting to hear from the dyno place now to see what they can do.

[fazersharp]

Just an advisory---------- my yellow one was 16 years old (only 16k miles of air through it though )

[odbguy]

5k buzzing happens with all fazers.

Can I just jump in on this one.
Iv experienced a buzzing/vibrating noise with my fazer but not at 5k.
It starts at 2.5k and stops soon as it hits 3k.
Happens in every gear and at whatever the speed ..

Iv had a quick look thru old threads and there's very mixed opinions from needing to rebalance the carbs too cam chain rattle ..
Not many that say it's normal but is this possibly the case or should I look further into the issue?

[fazersharp]

I have a buz at a certain RPM but I only hear it at standstill without me lid on, and only if i keep the revs there, I think its the indicator storks on the fairing. But when moving I dont hear or feel anything

[odbguy]

Iv had a word with my dad and were going to give the bike a once over and he's going to show me how to balance the carbs  ...

Hurrah for Dad's!  Lol never thought I'd say that at almost 30 !! Haha

[Silverlegacy]

Iv had a word with my dad and were going to give the bike a once over and he's going to show me how to balance the carbs  ...

Hurrah for Dad's!  Lol never thought I'd say that at almost 30 !! Haha

I sync'd my carbs last week and the bike did seem to run a little better, but they wernt that far out so think the problem with mine lies elsewhere.
I did all the normal stuff first to eradicate the vibrations and noises, like the headlight mod and securing indicators, pretty much stripped off the whole front and put new washers and stuff on the secure any loose bolts or cure and free play in the fairing.
Ive checked as many mounting bolts as i can find and tried everything else i can think of at the minute.

[darrsi]

I have a buz at a certain RPM but I only hear it at standstill without me lid on, and only if i keep the revs there, I think its the indicator storks on the fairing. But when moving I dont hear or feel anything

Indicators can cause a buzzing on the fairing.


Headlight bulbs can cause a buzzing on their housing, which i sorted with self amalgamating tape.


Also had a buzzing from the plastic glass panel on the fairing, which i sorted with strips of soft sided velcro.


Not had it on this bike, but glass in wing mirrors can buzz too.

[JoeRock]

[quote author=ChristoT link=topic=16061.msg184523#msg184523 date=1424712770]
Sorry, Darrsi, got to disagree.

The kit in my ZX4 made it pull OK, but ran out of puff top end. Best thing to do is find an open "private" road, take her up to a ton. If it still pulls, all good. If not, check your carbs.

It was just a theory,  I've never actually ridden a restricted bike before.
[/quote]


You're right Darrsi - they don't accelerate at all hard through the gears. if you're accelerating from a start the best way to put it is they go like normal to 5k revs or so, but then you just don't get any more oomph!

[Millietant]

Silverlegacy, what you're describing sounds pretty much exactly like my son's Fazer 600 when we had it restricted to 33bhp for him.

The restrictors are 4 big steel "washers" which just slot in the carb mouths - so that when the throttle is wound fully open, there's only the hole in the middle letting air through, and it's only about 1/3 of the size of the carb mouth.

This means that no matter how far you wind the throttle open, things happen slowly after 5k / 6k RPM's, especially in the top two gears.

Cruising on the motorway at 70 didn't leave much in reserve for instant overtaking.

If, when you're riding it, the bike performs reasonably well on part throttle, but it just doesn't seem to do anything more when you wind the throttle past halfway, I'd say your bikes restricted - as long as it runs cleanly and doesn't misfire.


Maybe just take off (or pull back) a carb inlet rubber and you'll soon see if there's a washer stuck in the carb mouth - the aperture left open on our sons bike was probably less than about 20mm diameter.

[Silverlegacy]

Silverlegacy, what you're describing sounds pretty much exactly like my son's Fazer 600 when we had it restricted to 33bhp for him.

The restrictors are 4 big steel "washers" which just slot in the carb mouths - so that when the throttle is wound fully open, there's only the hole in the middle letting air through, and it's only about 1/3 of the size of the carb mouth.

This means that no matter how far you wind the throttle open, things happen slowly after 5k / 6k RPM's, especially in the top two gears.

Cruising on the motorway at 70 didn't leave much in reserve for instant overtaking.

If, when you're riding it, the bike performs reasonably well on part throttle, but it just doesn't seem to do anything more when you wind the throttle past halfway, I'd say your bikes restricted - as long as it runs cleanly and doesn't misfire.


Maybe just take off (or pull back) a carb inlet rubber and you'll soon see if there's a washer stuck in the carb mouth - the aperture left open on our sons bike was probably less than about 20mm diameter.

Thanks for the info.
I was going to look and see if i could see down the carb rubbers but all looks a bit complicated to me, i took tank off to check air filter and other little bits but just cant see how to check that with out stripping off lots of stuff, and think its a bit beyond me.
I have found a local place who will dyno it for me for £45, so hopefully going to get that booked in Tuesday next week.
Hopefully I can pinpoint the issue, the bikes fine and below 5-6k and a joy to ride under 50mph, just beyond that its not so fun.

[Mark YPVS]

When i got my Fazer it was restricted with the genuine Yamaha kit ( carb springs, needles and a small plate in each carb), the bike went like a normal Fazer until you hit about 7500 rpm (in any gear ) at which point the power stopped and the bike vibrated really bad ( 110mph in top).
Where abouts are you , some one local who has a Fazer 600 could take it for a spin ??


Mark

[Silverlegacy]

When i got my Fazer it was restricted with the genuine Yamaha kit ( carb springs, needles and a small plate in each carb), the bike went like a normal Fazer until you hit about 7500 rpm (in any gear ) at which point the power stopped and the bike vibrated really bad ( 110mph in top).
Where abouts are you , some one local who has a Fazer 600 could take it for a spin ??


Mark

Sounds pretty much like mine, do Yamaha fit the genuine kits or do these get fitted afterwards? besides stripping it down is there any way of knowing?
I live near Stafford, but dont know many other bikers around here, migth try mu local dealership see if they have any older bikes in to try of similar type? doubt they got any 98 fazers in though.

[Mark YPVS]

I think mine was fitted by Dave Death Motorcycles in the Isle of Wight , it was restricted when i got it, have you checked the paper work / service folder, mine had all the bits in the folder to return to unrestricted, but as said on here a quick Dyno run will soon tell, i think i still have the restricted kit, i will have a look at the weekend , if i find it i will post a pic, you can then take the top of your carb off and check the needle/ spring, if it looks like my ones it may be restricted 


Mark

[Silverlegacy]

Thank for that Mark YPVS.
I didnt have much paperwork and stuff when i bought it as it was a dealer part ex, the bike has a few aftermarket bits fitted to it, but no info on whether it was restricted or not, i contacted the dealer, but they dont know and only had it as a trade so didnt really know much about it in the first place.
I can check straight forward stuff just nothing to heavy on the technical side. bit embarrassing really.

[noggythenog]

Obviously up to you now what direction you want to take but it looks like with all the aove that it would at least be worthwhile investigating the restriction.


Appreciate it costs money but if it was me at this stage i would put the bike into a yamaha dealers and just ask them to inspect for and remove any restriction kit.....a yamaha mechanic yas no doubt seen them a million times and will be an easy job for them and if there isnt anyting then it has come from a good source and you can take things from there more accurately.

[Silverlegacy]

Hoping to get it into a garage tuesday/wednesday next week to have it dyno'd and checked over, i can only check so much, so would rather have a professional look at it, not over fussed about spending money on it as i want it running right so would rather pay that little bit extra to get it sorted than trying to fudge it myself and cause more damage than good.
Thanks for all the advice anyway and appreciate everyone taking time out to share there knowledge with me.

[Ruby Racing]

I don't know if it's possible, but if it is it's FREE.


Take out your air filter and have a look towards the carb inlets, with a torch shining on the inlets, open the throttle and see if you see anything in the carb inlet.

[Silverlegacy]

I don't know if it's possible, but if it is it's FREE.


Take out your air filter and have a look towards the carb inlets, with a torch shining on the inlets, open the throttle and see if you see anything in the carb inlet.

Interesting, although i too have no idea if its possible this way, I know that i can shine my phone torch inside and take a picture of the air box side of the carb, whether i can see further after opening throttle?
Not sure what internal parts get in the way beyond that?
Not sure if anyone else can comment on this ? if its at all possible?

[Silverlegacy]

I might have to have a look at this and see if it can be done?
I have tried looking on google for any good pictures of carbs to see if its possible, but not much luck?
Has any one done any work on carbs to know if this would be the case or is there just too much in the way internally? to get a clear view?
Its either that or wait til next week to get it dyno'd